Persistent Localhost
davidondrej/skills
Manage persistent dev servers, APIs, and other local processes on a port using macOS LaunchAgents.
Open the local OpenMMO development game in the Codex in-app browser, sign in with Google, select the default character, and press Start to enter the game.
Custom licenceAuto-check passed
Install Open Localhost Game
$ npx skills add Julian-adv/OpenMMO --skill open-localhost-game -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install Julian-adv/OpenMMO open-localhost-game --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/Julian-adv/OpenMMO.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.codex/skills/open-localhost-game .claude/skills/open-localhost-game && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "open-localhost-game" agent skill from https://github.com/Julian-adv/OpenMMO/tree/master/.codex/skills/open-localhost-game into .claude/skills/open-localhost-game/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "open-localhost-game", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/Julian-adv/OpenMMO/tree/master/.codex/skills/open-localhost-gameType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add Julian-adv/OpenMMO --skill open-localhost-game -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install Julian-adv/OpenMMO open-localhost-game --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Julian-adv/OpenMMO.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.codex/skills/open-localhost-game .agents/skills/open-localhost-game && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "open-localhost-game" agent skill from https://github.com/Julian-adv/OpenMMO/tree/master/.codex/skills/open-localhost-game into .agents/skills/open-localhost-game/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "open-localhost-game", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add Julian-adv/OpenMMO --skill open-localhost-game -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install Julian-adv/OpenMMO open-localhost-game --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Julian-adv/OpenMMO.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.codex/skills/open-localhost-game .cursor/skills/open-localhost-game && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "open-localhost-game" agent skill from https://github.com/Julian-adv/OpenMMO/tree/master/.codex/skills/open-localhost-game into .cursor/skills/open-localhost-game/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "open-localhost-game", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/Julian-adv/OpenMMO.git --path .codex/skills/open-localhost-game--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add Julian-adv/OpenMMO --skill open-localhost-game -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install Julian-adv/OpenMMO open-localhost-game --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Julian-adv/OpenMMO.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.codex/skills/open-localhost-game .gemini/skills/open-localhost-game && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "open-localhost-game" agent skill from https://github.com/Julian-adv/OpenMMO/tree/master/.codex/skills/open-localhost-game into .gemini/skills/open-localhost-game/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "open-localhost-game", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install Julian-adv/OpenMMO open-localhost-gameInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add Julian-adv/OpenMMO --skill open-localhost-game -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/Julian-adv/OpenMMO.git skills-src && mkdir -p .github/skills && cp -r skills-src/.codex/skills/open-localhost-game .github/skills/open-localhost-game && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "open-localhost-game" agent skill from https://github.com/Julian-adv/OpenMMO/tree/master/.codex/skills/open-localhost-game into .github/skills/open-localhost-game/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "open-localhost-game", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add Julian-adv/OpenMMO --skill open-localhost-game -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install Julian-adv/OpenMMO open-localhost-game --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Julian-adv/OpenMMO.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.codex/skills/open-localhost-game .opencode/skills/open-localhost-game && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "open-localhost-game" agent skill from https://github.com/Julian-adv/OpenMMO/tree/master/.codex/skills/open-localhost-game into .opencode/skills/open-localhost-game/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "open-localhost-game", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
open-localhost-game- GitHub stars
- 1.8k
- Token cost
- ~693 tokens
- SKILL.md length
- 297 words
- Files
- 2
- Skills in repo
- 8
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Open the local OpenMMO development game in the Codex in-app browser, sign in with Google, select the default character, and press Start to enter the game.
- Works in 9 steps: Use the browser-use:browser skill and… → Navigate to http://localhost:10004/… → If the login screen shows an error… → …
- The user asks Codex to connect to localhost:10004
- SKILL.md covers Overview, Workflow, Browser Notes and Reporting
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Open Localhost Game is an agent skill from Julian-adv/OpenMMO. Open the local OpenMMO development game in the Codex in-app browser, sign in with Google, select the default character, and press Start to enter the game. Use when the user asks Codex to connect to localhost:10004, log into OpenMMO, choose the default character, start the game, or restore the browser to the in-game state.
Its SKILL.md is about 690 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `agents/openai.yaml`).
When your agent uses it
- The user asks Codex to connect to localhost:10004
- Log into OpenMMO
- Choose the default character
- Restore the browser to the in-game state
Example prompts
- “/open-localhost-game”
Workflow steps
9 steps, taken from the first numbered list in SKILL.md.
- Use the browser-use:browser skill and the in-app browser runtime.
- Navigate to http://localhost:10004/ unless the current tab is already there
- If the login screen shows an error instead of the button (e.g.
- Click the Sign in with Google button.
- In Google's popup/account chooser: if an account is already signed in, select
- Confirm the character-select screen appears (Character Select + the account
- Keep the default selected character unless the user requests another.
- Click Start.
- Confirm the game UI appears. Expected signals include Chat, Inventory (I),
What it can do on your machine
Read from SKILL.md and the folder at commit 7d96fb6. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are javascript).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Open Localhost Game loads about 693 tokens when it runs. Until then it costs about 86 tokens; SKILL.md has 297 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 297 words (~693 tokens).
“Drive the Codex in-app browser through the local OpenMMO entry flow. Login is Google OAuth only (password login was removed). The expected path is: open http://localhost:10004/, click Sign in with Google, complete Google's account chooser, keep the default selected character…”
- name
- open-localhost-game
Files
SKILL.md and 1 other file in .codex/skills/open-localhost-game of Julian-adv/OpenMMO.
- SKILL.md
- agents/openai.yaml
Open the folder on GitHubat commit 7d96fb6
Compare with similar skills
Open Localhost Game next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Open Localhost Game this skillJulian-adv/OpenMMO | 1.8k | — | ~693 | Automated safety check: Pass | Custom licence | |
| Persistent Localhostdavidondrej/skills | 4.1k | — | ~618 | Automated safety check: Pass | MIT | |
| BrowserStack Live Testinghandsontable/handsontable | 22k | — | ~950 | Automated safety check: Pass | Custom licence | |
| Firebase Basicsgoogle/skills | 21k | — | ~1.9k | Automated safety check: Pass | Apache-2.0 | |
| Control Browserzai-org/ZCode | 7.6k | — | ~4.6k | Automated safety check: Pass | Apache-2.0 | |
| Agent Browsersuperagent-ai/grok-cli | 3.5k | — | ~633 | Automated safety check: Pass | MIT |
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Questions about Open Localhost Game
What does Open Localhost Game do?
Open the local OpenMMO development game in the Codex in-app browser, sign in with Google, select the default character, and press Start to enter the game. Open Localhost Game is an agent skill from Julian-adv/OpenMMO. Open the local OpenMMO development game in the Codex in-app browser, sign in with Google, select the default character, and press Start to enter the game.
When should I use Open Localhost Game?
Open Localhost Game fits situations like: the user asks Codex to connect to localhost:10004; log into OpenMMO; choose the default character; restore the browser to the in-game state.
How do I install Open Localhost Game in Claude Code?
Run `npx skills add Julian-adv/OpenMMO --skill open-localhost-game -a claude-code`. Or copy the skill folder (.codex/skills/open-localhost-game in Julian-adv/OpenMMO) into .claude/skills/open-localhost-game in your project. Claude Code loads it when a task matches its description.
How do I install Open Localhost Game in Codex?
Run `npx skills add Julian-adv/OpenMMO --skill open-localhost-game -a codex`. Or copy the skill folder (.codex/skills/open-localhost-game in Julian-adv/OpenMMO) into .agents/skills/open-localhost-game in your project. Codex loads it when a task matches its description.
Can I use Open Localhost Game in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add Julian-adv/OpenMMO --skill open-localhost-game -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/open-localhost-game, .gemini/skills/open-localhost-game, .github/skills/open-localhost-game and .opencode/skills/open-localhost-game in your project.
What does Open Localhost Game need to run?
SKILL.md names no scripts, command-line tools or credentials: Open Localhost Game is instructions for the agent only.
Does Open Localhost Game access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Open Localhost Game safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Open Localhost Game use?
Open Localhost Game has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does Open Localhost Game use?
About 693 tokens (SKILL.md is roughly 2.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Open Localhost Game?
Skills that share tags, products or a category with Open Localhost Game: Persistent Localhost (davidondrej/skills, 4.1k stars), BrowserStack Live Testing (handsontable/handsontable, 22k stars), Firebase Basics (google/skills, 21k stars) and Control Browser (zai-org/ZCode, 7.6k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Open Localhost Game?
Julian-adv (a GitHub user) maintains it in Julian-adv/OpenMMO, which has 1,787 GitHub stars. The repository holds 8 skills in this directory. The repository was last updated on October 10, 2026.
Source: Julian-adv/OpenMMO on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.